Powertrain, generic · Fuel and air metering (injector circuit)

P02E0 Diesel Intake Air Flow A Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The diesel intake air flow valve A is the throttle flap ahead of the intake manifold of a diesel engine: it creates the vacuum needed for high EGR rates, lowers airflow to heat the particulate filter and catalyst during regeneration and closes at switch-off against run-on shaking. A spring holds it open when unpowered; an electric motor positions it, with a position sensor reporting back. P02E0 means the motor circuit is open – cable, connector or motor winding. GM diesels detect more than 200 kΩ with the driver off, after about 1.5 s (6.6 litre LML: 7 s), two trips. On a fault the valve is switched off and the spring opens it: driving is usually little affected, but EGR control is restricted and filter regeneration may be blocked.

Likely causes

Connector at the throttle corroded or loose
Broken motor wire
Motor winding of the valve open
Driver stage in the engine module

Symptoms

  • Check engine light on
  • Often no noticeable change
  • Filter regeneration does not run, soot load rises
  • Shaking at switch-off

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–500
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

diesel intake throttle valvethrottle valve motoractuator wiring

Related codes

P02E2P02E3P02EBP02E1P2100

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, ms-motorservice.com.